Opening the reheating box in multifield inflation

Understand

The robustness of multi-field inflation to the physics of reheating is investigated.

• In order to carry out this study, reheating is described in detail by means of a formalism which tracks the evolution of scalar fields and perfect fluids in interaction (the inflatons and their decay products).
• This framework is then used to establish the general equations of motion of the background and perturbative quantities controlling the evolution of the system during reheating.
• Next, these equations are solved exactly by means of a new numerical code.